□ Abrasion or corrasion
◇ Involves the removal of loosened materials of the rocks of valley walls and valley floors with the help of erosional tools (boulders, pebbles, cobbles, etc.). The erosional tools or river loads move down the channel gradient along with water and thus strike against the rocks which come in contact with them. Thus, abrasion is the mechanism of breakdown of rocks occasioned by erosional tools carried by the rivers.
□ Attrition
is the mechanical tear and wear of the erosional tools in themselves. The boulders, cobbles, pebbles etc. while moving with water collide against each other and thus are fragmented into smaller and finer pieces in the transit.
□ Hydraulic action
involves the breakdown of the rocks of valley sides due to the impact of water currents of channel. In fact, hydraulic action is the mechanical loosening and removal of materials of rocks by water alone.
@cseupscnotes
◇ Involves the removal of loosened materials of the rocks of valley walls and valley floors with the help of erosional tools (boulders, pebbles, cobbles, etc.). The erosional tools or river loads move down the channel gradient along with water and thus strike against the rocks which come in contact with them. Thus, abrasion is the mechanism of breakdown of rocks occasioned by erosional tools carried by the rivers.
□ Attrition
is the mechanical tear and wear of the erosional tools in themselves. The boulders, cobbles, pebbles etc. while moving with water collide against each other and thus are fragmented into smaller and finer pieces in the transit.
□ Hydraulic action
involves the breakdown of the rocks of valley sides due to the impact of water currents of channel. In fact, hydraulic action is the mechanical loosening and removal of materials of rocks by water alone.
@cseupscnotes
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What is the name of cleanest river of India, which is located in village Mawlynnong in Meghalaya and acts as a natural divide between Jaintia and Khasi hills, before finally flowing into Bangladesh?
Anonymous Poll
48%
Dawki or Umngot river
22%
Kopli river
19%
Myntdu river
12%
Kulsi River
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What is the name of cleanest river of India, which is located in village Mawlynnong in Meghalaya and acts as a natural divide between Jaintia and Khasi hills, before finally flowing into Bangladesh?
Umngot River, Popularly known as Dawki river, the Umngot river in Meghalaya is undisputedly the cleanest river in Asia with its crystal clear water. It originates from the Eastern Shillong Peak, which is located 1,800 m above sea level.
The river is in the village of Mawlynnong ("God's Own Garden") in Meghalaya, close to India’s border with Bangladesh, which is touted as Asia’s Cleanest Village.
Join @cseupscnotes
It acts as a natural divide between Jaintia & Khasi hills, before finally flowing into Bangladesh.
The river is in the village of Mawlynnong ("God's Own Garden") in Meghalaya, close to India’s border with Bangladesh, which is touted as Asia’s Cleanest Village.
Join @cseupscnotes
It acts as a natural divide between Jaintia & Khasi hills, before finally flowing into Bangladesh.
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Committee recommendation(1).pdf
839.7 KB
Mains Notes By Shubham Bhaisare, AIR 97, CSE 2021
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